I have created a new droplet “Discourse-beta-ubuntu”, then I connected to the Droplet with Putty (root - password) and Discourse’s setup is started.
But setup doesn’t work:
Ports 80 and 443 are free for use 'samples/standalone.yml' -> 'containers/app.yml' Found 1GB of memory and 1 physical CPU cores setting db_shared_buffers = 128MB setting UNICORN_WORKERS = 2 containers/app.yml memory parameters updated. Hostname for your Discourse? [discourse.example.com]: forum.mywebsite.eu Checking your domain name . . . WARNING:: This server does not appear to be accessible at forum.mywebsite.eu:443. A connection to http://forum.mywebsite.eu (port 80) also fails. This suggests that forum.mywebsite.eu resolves to the wrong IP address or that traffic is not being routed to your server. Google: "open ports YOUR CLOUD SERVICE" for information for resolving this problem. If you want to proceed anyway, you will need to edit the containers/app.yml file manually. Discourse is now installed. Log into your admin account in a browser to continue configuring Discourse.
I have bought the domaind from register.it and added to Cloudflare. I have changed only DNS, to redirect to Cloudflare.